The assessment of behaviour lies at the heart of judicial decision-making. Judges are routinely required to evaluate credibility, consistency, and presentation in determining the reliability of evidence.
Such assessments have traditionally proceeded on the assumption that behaviour is broadly rational, linear, and capable of consistent presentation. However, developments in psychology and neuroscience increasingly call that assumption into question. Contemporary research in cognitive science indicates that memory is not a fixed record of events, but a reconstructive process shaped by context, stress, and the manner in which recall is elicited.
It is now well recognised that trauma, stress, and neurodiversity, particularly ADHD, may materially affect how individuals present, recall events, and respond under scrutiny. These influences arise through distinct, though sometimes overlapping, mechanisms: trauma may affect emotional salience and memory encoding, whereas ADHD is more commonly associated with differences in attention, sequencing, and executive functioning. Importantly, trauma and ADHD are not mutually exclusive and may co-occur, with their effects being cumulative and, at times, more pronounced in combination.
A witness who appears inconsistent is not necessarily dishonest. A parent who presents as emotionally dysregulated is not necessarily incapable. A party who struggles to provide a clear chronological account is not necessarily evasive.
Such features may instead reflect a nervous system operating under conditions of perceived threat.
Historically, courts have placed weight on composure, consistency, and clarity as indicators of credibility. Those who present in a measured and coherent manner are often regarded as more reliable, whereas those who do not may attract adverse inferences.
Whilst there have been developments in understanding trauma, there remains a risk that its effects are not fully considered in the assessment of behaviour, particularly in relation to the encoding and retrieval of memory. It is further recognised that the process of questioning itself, particularly within adversarial proceedings, may exacerbate inconsistency rather than reliably expose it.
Under conditions of stress, individuals may:
· experience difficulty recalling events sequentially, even where individual details are accurately retained;
· present inconsistently over time; or
· exhibit heightened emotional responses or, conversely, withdrawal.
These responses are not, of themselves, indicative of dishonesty. They may instead be consistent with the effects of stress on memory retrieval and emotional regulation.
The implications are particularly acute in family proceedings, where the court is required to make determinations of significant and lasting consequence. If behaviour is misinterpreted, there is a real risk that credibility is improperly assessed, vulnerability insufficiently recognised, and parenting capacity misunderstood.
This is not to suggest any dilution of evidential standards, nor that inconsistency is irrelevant to the assessment of credibility. Rather, it is to recognise that such features must be interpreted with appropriate caution and in light of established scientific understanding. The framework within which behaviour is assessed must remain responsive to that understanding.
A trauma-informed approach does not displace legal analysis; it refines it.
The law does not operate in isolation from human experience. As understanding of the brain evolves, so too must the lens through which behaviour is evaluated.
To proceed otherwise is to risk reliance on assumptions that no longer reflect the realities of those who come before the court. Where behaviour is misread, the consequence extends beyond mere error; it risks conclusions that are not simply imperfect, but wrong.
